Blowpipe



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J. HARJRHS im 299 ma l BLOWPIPE Filed Aug;

ramas am. 29,1924.

, TED ATES 1,481,8lf A JOHN HARRIS, OF LAKEWOOD, OHIO, ASSIGNOR TO CARBO-OXYGEN COMPANY, F PITTSBURGH, PENNSYLVANIA, A CORPORATION OF DELAWARE.

BLOWPIPE.

pplcation led August 11, 1919. Serial No. 316,556.

of Ohio, have invented a certain new and useful Improvement in Blowpipes, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

This invention relates to blow pipes, and more particularly to the heads and tips thereof, it being the general object of the invention to improve the mode of delivering the gases to the preheating jets of such l5 pipes whereby an eiiicient mixture of such p gases is provided and the flashing back or propagation of Haine into the interior of the head is prevented, notwithstanding wide variations in the pressure of such mixture.

I accomplish the foregoing objects in and through the construction and arrangement of parts shown in the drawings forming part hereof, wherein Fig. 1 represents a side elevation of a blow pipe constructed in accordance with my invention; Fig. 2 a longitudinal central sectional view through the head of such a blow pipe and the adjacent ends of the supply tubes; Fig. 3 an elevation of the inner member of the tip; and Figs. 4,

5 and 6 sectional details corresponding respectively to the lines 4 4, 5 5 and 6 6 of Fig. 2.

Describing the parts by reference characters, A denotes the handle of a blow pipe through vwhich there extend the pipes 1, 2

and 3, said pipes communicating at their rear ends'with passagewa'ys in 'a casting B to which the handle A is secured, the said casting being provided with connections for the. oxygen supply pipe'4 and the combusti- V"ble gasSuPply p1 e 5, the supply of oxygen to the, pipes 1 an 2'being controlled by the valve 6 and the supply of combustible gas to the pipe 3 being controlled bythe valve 7.

linaddition, the supply of oxygen from the pipe 1 for cutting purposesvis further controlled by the .valve 8 having an operating handle 9. Theparts 1-9 inclusive in their details cover no part of the invention for which protection is sought in thisapplicaf tion. For instance, the valve 8 may be constructed in the manner shown, described and claimed in my copending yapplication No.

225,431 ledMarch 29, 1918.

At their .front ends, the pipes 1,2 and 3 are connected to the rear of the blow pipe head 10 and communicate respectively with a chamber 11 and with passageways 12 and 13 in said head. The chamber 1'1 is shown as cored and branched, the front ends of the branches merging, as shown at 11B, above the central head passageway 14 for the cutting oxygen. Between the branches of the chamberJ 11 the head is drilled, as indicated at 15, 15a and 15b, the bore thus provided extending nearly in the samev direction as the central oxygen passageway 14 and forming only a slight angle therewith. It will be noted that the portion 15 of this slightly inclined bore is threaded, while the unthreaded portion 15a is of somewhat smaller diameter than the portion 15 and the por- A with the passageway 12.

Mounted within the three parts ofl'said bore is almixing plug comprising an externally threaded body 17 having a reduced projection 171l at the upper end thereof.

. From the lower end of the threaded portiont 17 of said plug there projects a reduced extension 17b connected by a tapered seat 17- with a still further reduced extension 17" adapted to fit within the bore section 15b and preferably projecting into a chamber 18 in said head. The plug is provided with a central passageway 19 extending therethrough and communicating at itsupper end with a chamber 20 provided in the head above said plug and between .the same and a plug 21 which is threaded into the upper portion of the bore 15, the last mentioned plug being provided with a head 22 and -with a washer 23 adapted to be compressed between vsaid head and a seat on top ofthe blow plug 1s .provided with a pair of inclined pipey head. The portion- 17b of said ports 19a communicating at their'outer ends with the annular chamber surrounding'said portion of the plug and'at their inner ends with the centra passageway 19.

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The tip as a whole comprises an inner member 24 and an outer member, to be referred -to hereinafter. The inner member is formed as a plug having a central axial bore 25 which is preferably of the same diameter, throughout the major portion of 1ts length,

as the passageway. 14 and adapted to register drical enlargement 27 of smaller diameter portions 26 and 28 are adapted to fit snugly than 26 and merging at its lower end with a tapered or frusto-conical surface-28. The

within the outer tip member, as will be ex- -plained hereinafter, and provide means for centering the inner tip member within the outer tip member as well as means whereby passageways may be provided between said.

members for conducting a mixture of .preheating gases to the delivery end of the pipe. Between the portions 26 and 27 the inner tip member is provided with an annular rel cess 29 extending therearound and adapted to form a distributing chamber with the outer tip member. y

26 denotes slots, which may be of any desired shape, extending radially inwardly from the outer wall of the projection 26 and providing passageways serving to conduct the mixture of gases from the distributing chamber 18 to the annular distributing chamber provided by the recess 29 and the surrounding wall of the outer tip member and thence through the narrow annular chamber formed between said outer tip member and the projection 27 to a series 0E slots 28 extending radially inwardly from the outer surface of the tapered or frustoconical portion 28 of the inner` tip member.

`Above the projection 26, the inner tip 'member is reduced in diameter, as shown at 30, and is provided at its upper end with an enlargement 31 which is adapted to be threaded into a, bore 32 provided in the head below the pasmgeway 14, said bore extending upwardly from the chamber 18. Above the threaded portion of the inner tip member the latter is providedwith a rounded headi- 32 adapted to engage a beveled seat 33, beneath the lower end of the passageway 14. i p

'Cooperating with the `inner tip member is the outer vtip member 34, the latter memberbhaving a cylindrical upper end adapted to e cylindrical 'chamber provided within the head and having a lower frusta-conical end 34a. The upper and lower ends of the outer tip member form each a close t with the por-tions 26 and 28 of the inner member, respectively, the upper endl of the outer slipped within the lower end of thev merece member being preferably flush with the upper end of the projection 26.-v Between the portion 27 of the inner tip member and the surrounding wall of the outer tip member, an extended annular chamber 35 is provided which communicates at-its upper end with the annular distributing chamber provided by the recess 29 and the surrounding wall o-f the outer tip member and at its lower end with the passageways formed by the slots 28a. In practice this chamber will be about l/64,inch in width or clearance and will positively prevent any propagation of flame from the slots 28;l to the chamber 29 and the passageways and chambers therebeyond irrespective of variations of pressure in the mixture of preheating gases and in the comway 19 of vthe plug 17. Combustible fluid ,will be conducted through the pipe 3,y p assagewa'y 13, and the chamber surroundingthe reduced portion 17" ofA the` plug into the inclined passageways 19"L and thence into L thecentral passageway 19. The gases will be mixed in part' in the lower end of the passageway 19 and discharged into the chamber 18, where it is further mixed and whence the mixture is distributed to the slots 26 into the distributing chamber 29 and thence through the restricted annular chamber 35 to the pre-heating 'slots or passageways 28B. After the metal has been preheated to the desired extent, the valve 8 will be operated by the handle 9, thereby to supply cutting oxygen to the pipe 1, chamber 11, passageway 14 and bore sections 25 and 25a to the delivery end of the pipe. The construction of the plug 17 and its mode of cooperation with theY oxygen and combustible gas insure a. complete and elicient mixture of these gases before they are delivered to the preheating slots, and the interposition of the restricted annular chamber 35 between the preheating slots or jets and the mixing portions of the head `positively prevent the propagation of flame to such portions of such'head.

The chamber 1 8 enables the mixture supplied thereto by the injector plug to be distributed uniformly to the passageways provided by the slots 26, and the distributing chamber 29 enables the mixture discharged plug and a second passageway communicating with the said annular chamber.

enables the inner tip member to be accurately centered within the outer tip member.

Having thus described my invention, what l claim is:

1. In a blow pipe, the combination of a head havin a branched chamber for cutting oxygen am? a tip having a central bore for such cutting oxygen and passageways for preheating gases surrounding said bore, said head having a bore extending between the branches of said chamber and in approximately the direction of the first mentioned bore and also having pasageways for preheating oxygen and combustible gas communicating with such second bore,`and a plug in such second bore having a passage' way extending therethrough and adapted to receive the preheating oxygen and provided with ports communicating with its passageway and adapted to conduct combustible gas thereto, said head having a chamber with which the lower end of the passageway in said plug communicates and with which the passageways in said tip also communicate.

2. In a blow pipe, the combination of a head having a mixing chamber therein and a bore having a reduced portion extendin from saidmixing chamber and an enlarged portion beyond the reduced portion with a seat interposedbetween such portions, and a plug adjustably mounted in said bore and having a reduced portion substantially fitting the reduced portion of the bore and a portion cooperating with said seat and form-l ing an annular chamber with the enlarged portion of the bore and a portion beyond the second mentioned portion and fitting within the enlarged portion of the bore, the said plug havin a central passageway therethrough an passage-ways extending from said central pasageway to the chamber surrounding the second portion of said plug, and the said head having a passageway communicating with the enlarged ortion of the first mentioned bore beyond t e -endof the 3. ln a blow` pipe, thel'combination of a head having a mixing chamber and a bore -extending upwardly fromsaid chamber and comprising a reduced portion communicating directly with said chamber, an intermediate enlarged portion` beyond 'such reduced portion with a seat interposed between reduced portion of said bore with a surface adapted to engage the `seat provided between the intermediate and threaded portions :of said bore, the 'said plug being provided a central passageway extending therethrough andA with lateral passageways extendingv from said central passagewayY to the said annular chamber, and a second plug threaded into the outer end of the said bore and providing a chamber with the outer end of the first mentioned plug, thesaid head having passageways communicating respectively with the second and third chambers.

4f. In a blowpipe, the combination of a head having a chamber for cutting oxygen and a passageway leading from said chamber. an inner tip member having a central bore registering with said passageway,

the said head being provided with a chamber surrounding the upper portion of said member, an outer tip membensurrounding the inner tip member and extending downwardly from said chamber, passageways for preheating gases being provided between said tip members and extending downwardly from the said chamber, a plug within said head and at one side of the upperend of v said inner tip member and having a passageway therethrough adapted to discharge into said chamber and provided intermediate of its ends with a lateral passageway communieating with its first mentioned passageway, means for delivering a gas to the first mentioned passageway of said plug at the end which is remote from said chamber, and

means for delivering another gas throughthe lateral passageway to the first mentioned plug assageway. p

5. n a blowpipe, the combination of a head having a distributing chamber therein for preheatmg gases and means for deliverlng to such chamber a mixture of such preheating gases, a tip connected to said head and having a central bore for cutting oxygen and a plurality of passageways extending longitudinally thereof and communicating bore. such portions, and an enlarged threaded por- 6. in a blowpipe, the combination of a head having an' annular distributing chamberand means-for delivering a mixture of preheating gases to said chamber, a tip having its central upper portion projecting through said chamber, said tip having a central bore therethrough for cutting oxygen.,-

and means for supplying such cuttin oxygen Jfrom said head to said bore, said tip having below the said distributing chamber a plurality of passageways communicating izo dat their upper ends with the said distributing `downwardly from the second distributing chamber, said tip having at its lower end a plurality of passageways communicating at 1toheir upper ends with the said annular cham- 7. ln a blowpipe, the combination of a head having a chamber in the lower portion thereof, a tip comprising an outer member mounted in the lowerrportion of said chamber and an inner member within the outer member and having a central portion extending across and above 'the said chamber, the inner tip member being provided with a central bore' and fitting within the upper portion of the outer tip member, there being a plurality of passageways formed in the inner tip member and communicating at their upper ends with the upper portion of said chamber and at their lower ends with an annular distributing chamber formed in said tip and surrounding the inner member, the lower end of the inner tip member fitting within the lower end of the upper tip member and being provided with delivery passages in such lower portion, there being a narrow annular chamber between the said tip members and communicating at its upper end with the second chamber and at'its lower-end with the last mentioned passageways, and means in said head for delivering a mixture of preheating gases to the first-mentioned chamber.

8. ln a blowpipe, the combination of a head havin a distributing vchamber therein for preheating gases and means for delivering to such chamber a mixture of such preheating gases, a tip connected to said head near-,eco ,l

and having a central bore for cutting oxygen and a plurality of passageways extendlng longitudinally thereof and communicating) at their upper ends with the said distri uting chamber and at their lower ends with an. elongated annular chamber rel stricted in width to prevent the propagation of flame therethrough, the said tip bein provided with passageways extending downwardly from the last mentioned chamber to the delivery end of the said tip, and means for delivering cutting oxygen to said bore.

9. ln a blowpipe, the combination of a head having an annular distributing chamber and mea-ns for delivering a mixture of preheating gases to said chamber, a tip comprising an inner member-'having its central upper portion projecting through said chamber and provided with a central bore therethrough for cutting oxygem-means for supplying such cutting oxygen from said head to said bore, said tip member having below' the said distributing chamber a projection, an outer tip member having its upper end surrounding and engagirg said projection and its lower end surroun ing and engaging the lower portion of the inner member, the said projection being provided with passa-geways communicatin at their upper ends with the said distributing chamber and at their lower ends with a narrow annular chamber formed between said members, said tip being provided at its lower ends with a plurality of delivery passageways for preheating gases communicating at their upper endsy with the said annular chamber.

In testimony whereof, l hereunto ax my signature.

JOHN nanars. 

